#define LEDPIN 15 
  
void setup() 
{
  // put your setup code here, to run once:
   Serial.begin(115200);
   pinMode(LEDPIN,OUTPUT);
}

void loop() 
{
  // put your main code here, to run repeatedly:
   Serial.println("helloworld");
   digitalWrite(LEDPIN,HIGH);
   
   delay(100);
   digitalWrite(LEDPIN,LOW);
   
   delay(100);
}
